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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9463b1824e05e573b1d062c627de088f3bae2ae68f5c44638d52bf5dbad27bc0' 
  AND token = 'b5MvTdIHJe3TGs5Kx5sHVwa2MQiscYLc5U/ggTQNNkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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