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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871a7b9cfe600402801c0e65f8531a3b5fece23e89b4a1428fe75524994e636a' 
  AND token = 'kDSqRYBxGb8/48AMe2OCzrnC6HCTimYqyKisrevZn+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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