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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa18c7b21f07f1ca9599b1d5a38ffedacb89a69553a45dc7b137ccda7d32ad65' 
  AND token = 'P4gIJN+y7WH2hFuHWI6Gll9Hy9kwNnt3YMKCtP4l7PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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