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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6934ee34297226f2f2dde1bc231c52548c8180764350015d2732b546ebf19bae' 
  AND token = 'LBBsl4vhvDNhw2vONlJ7E2hEd/ojFMUUTz8HPN8yeVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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