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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dcf7e610088d83cb4cbf64b5c9656b5594f765013dd37708da5860f8f9a015' 
  AND token = '1MKqkO8ARPrK6B6ebkSzBfcRJ2ASG50dj6dRZHK3SFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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