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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232610a402416904f309184bc2937564735e442f597d4c9e589531cd33a6d8cc' 
  AND token = 'UzMbRSzvUTBASZE0+Vpjbgs1tC2No8Q9kRPDo0pAkeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}