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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabc63b7e6c208e5338b17952acc9a677c3c37f355a6311ebb4300d53efc857d' 
  AND token = 'AMwLfDjz/4T+8rIOWuTOoj45GGLnAuMRc4/ZTTg7OOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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