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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c4f78c1f8dd1971fb5a72b7faf39cb6a1187c66a83e53d5ceb038c010cf073' 
  AND token = 'HMTcp4arkHSOo23/oQEG8l6Dda8jlIlnXaQWXTCP6/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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