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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd19346e4e38abbb05cefc8dcb9547545bae66858fe5952d4917c6256e6f83ff' 
  AND token = 'Y+Pr5WFdZgn45Jbzk5sBqILz7FLYBRbSqF4VZKTm+4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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