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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '273e95a13fa3b8361b4759be73064200e58ab8518a4a821d89110d5dfa446570' 
  AND token = 'AazggJYVTisuA7F3vzvO2zD2uO0ZVftBvGayWWX6K24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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