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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534c5187b737665c5de31eae3189b81c9341147d3655b1d00dd978c3e1e2b309' 
  AND token = 'SyIMnZFvouHgPgduyXu5HT2zKlzsPZDzR4fMhwR0f20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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