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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3428a47180c26750848bd4fa4fdd66b610b040bfcea848c29693ddfbb689084' 
  AND token = 'LoSy7wNeHcINAIl7t/SE9ByZLIdmUlH7uluSg51c780=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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