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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea60dad725386305de56da6b6fba0f2f949f00ce42fe56c7afa989f0b3573fb' 
  AND token = 'xwQrICogy2et9INZkuHiLiqGqjIhMoOIrv2g6t4n+HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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