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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9850384e8e31e8371c57fc2aa88e265147ee0879c6b8f8a054d1ae8719f273' 
  AND token = 'O47/vsFAh4/U+Yja1li89xAPGPNn4kfuwqmlz9hvfrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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