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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67406f5db08f82c53509849308f7b75cf3113b3104c51d1ee00c74efa1b9de4f' 
  AND token = 'kq/BR8n6Dz8z0hXtJWL5TxreGSH8e8aXfT3LTx1m4Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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