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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b69be6a6a4d7c7bd824b54a08ef83e062bfa85d257aa31d6be1a2cf0d2541df' 
  AND token = 'dvnfoctfb00+0cUHo4CylwEqHeHnhKBFFuvkcoC8mSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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