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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c234b11cd4bc63adf27297c569ef62498cf8841d489ea1c71634c62e2a3ceab' 
  AND token = 'YlW8lvRx3Dem86LgvCWiopV1oUKEKmvWcAGxgUwUg8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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