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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b4d8e5a2ace87658488abaa773f180f8aebb5589c70233f37d4af811b4c6a0' 
  AND token = '3LmEyTW7eYU4LtVge3i/B9pGSR8UH77OOmevd7/kdso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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