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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a28dc5842a93dc2835b5e624201903c5873a972d77ebef74a29cbe0c5f6b278' 
  AND token = 'wOedocjulhfqHbAD4k3XCdf3XQX4VleSQXhzh15LME0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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