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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8054e4088d8c62e1b1239403f18762bb8b7094e79b04e44c7f00fc7bb096d0' 
  AND token = '51Q5UZN5Jnm6w4AQcegOBFZssQJCUUDWd8T8zESpb7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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