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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2e865b8cf1efa2ed10ea396ee1f7d9f606bc87a02a024ea0a9881f21ed9f70' 
  AND token = '3qPqcYMFgVU45wb4GrI+TGAefpExHonhdB3ZPPZY3P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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