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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54c86bb6c9dfef4df275944d45067fa433cfa15a75bc2a37780c805079e9451' 
  AND token = 'hWvkD6ll06ZtP10OY4suOzP2JctbLHoxLuELEFNMG7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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