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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350b6ac3454a80e2a16feacf5ee74e3c4997d0a8ebaa3fb31de9354d32f0204d' 
  AND token = 'KIKz2+dIV3L2QVr6SCVXzKfv//M74D9YBNnSfJVOTmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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