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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37129e37c3a58f32d2c37984f7b974967fba0043e8ed98c3d1a126910d03b07f' 
  AND token = 'k0DyqtyOIuQfj5EBmYW9+L7eII1ef/3rQDrYoI/C8ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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