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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213d3281c423b7c8b69626991cfcb3e337653dada4c8e9bbceda2301f6e16d24' 
  AND token = 'Qa2NQwd9ZHUTM5YiVaG96i/FbG7M48Sa/nUAqUKeuwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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