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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d710a1c027ddb3826588fc257605536031d42deda32338ca6706d787865ff06' 
  AND token = '8mS5XKE9ANpP9t0cGpExQYyGx6Ms3f5Dnic4Chwpiaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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