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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7445f0235df1b59b5f87e50b5dc7f194296880bff4348e72c8b93816ea2cceb0' 
  AND token = 'QZHO/XHs3W3GTlUg6tlkg2NbvWe/74OY07sR7jlkeVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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