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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9b85a384ce440865759ce48f966e75bbcac273a9631cf0ee052d117a4b87bc' 
  AND token = 'AFZZQY/csMRbB9vv59E/Y7g5f9ozN0J2VuENiV8pWJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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