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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5edb8caf372d115fad4f35e4efc49ad3094086adeff5387481271da90941c1' 
  AND token = 'DNYWWx0/I1xBaf8flxpKEaf7a5u4nWtnI5qdIhqB4Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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