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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e1d1e49b352d57ab235d0243b62bdec22ff06b6a975a76a21389c70a16c459' 
  AND token = 'cLei8zBCSlh02QoV6ocKRX4qS2aJ8WNjfdgFKwAmnrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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