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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35f8e88b2ddafe222e6db721366635132a1c3cb86a6f787ee3086cae98166d8' 
  AND token = 'z97FQt2yFylimXpnjTF+a2F7deXn3XEnUg/ja3NLeHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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