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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd431acbad56a3c70970598c92f2c0f4ab1fc125a0f875b78bb294e4361cebe04' 
  AND token = 'NG9KcDvSgg0oHMsoyeIvufPUbZZ2P0WV8DMVX0tYSLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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