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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b3249cf11ed7dc5f2a4456c8038c6ffcbfebc94003e4762c508a81fb59c318' 
  AND token = 'Lsi5P+fUZN/QuqSiTKz5M4P4M1mogc+T01pZqbF6a68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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