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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86be358e7c2b76780ab963269f4d26673da0bf404b6d5be6a6522c2c82421e47' 
  AND token = '+6zQqVXbp9S2bOeWJH12rfmU9THDg6+hZAMrEfNcJ2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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