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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14a32bd224e73ff0484d9fc413b94f91904e7e65019fa362b43013055c3623a' 
  AND token = 'KQ60lVCozlPmY8Mh6Wtn/Kjq/EOQcQsNaCzaw3Idm/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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