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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714f4197cc3d5d969825a4d0be56d5ee85d352a7bd2fe23b7d225b6b341ea5f2' 
  AND token = 'c30knVgzgAcknQevOK57OXd7eyQbXwbMvho3AGs/31Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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