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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852e71db2edc9967923b50dbcc70bd9a0148d032e02f1ddb5cefd6061c7434bb' 
  AND token = 'vsqBXy4z5LMn4L4GaFUU7g5wgfLL6t4SCi9+2OB/K0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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