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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19063457175d3f191a13b118107a6ca7de8f4e555f34045b97303e0568ec78ea' 
  AND token = 'K2CMiEtQ8DcIOb9+KNq0W/zq/La3Z0PkTIPhqbwzdzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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