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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f48c9cd9932564ab2a7512c4370511b99854a4a9930cf9b2d9a1797bccb7900' 
  AND token = '/RndzxWlsqox5POve75vRHAHIWYtrLZqWOnFeio4KY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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