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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5b46c22b108f46a3ea2b93a832097c4b5cba8928cb927b211e5f065d2b035f' 
  AND token = '+yNXR+0WFzictMiJ8YKqO5Ib4oEr4UODpAbAPBFd07s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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