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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070334254bb0b5917b636b7cd77eb2846284450d5be4283c9c66ca8f8657b070' 
  AND token = 'tJRCxnIald44fQXBiuDq6TYwuiCbg/mpg/uUfuj+Xk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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