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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f50b994f223207bf24533726d8a5032f5e5de830b247d85f7f75e6ff3014262' 
  AND token = 'BjZ/RNjw2miNrEK5NuUbGP1IosyEnfPbfB8Ct8J4twA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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