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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f67b950aa80545e3ab1a6ef7f06abe6f8f42abdb272b2b5f698e7e98591c3d' 
  AND token = 'Sb6MKtP1jiiUdgzCxNwWzLM7KeMLp/6z0ubVokdmyi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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