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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa9b0806b2fd18dd8b1cddd7381147d41c9a03cf1791729bb97fb8b47575518' 
  AND token = '+lueGpoScbwQEn0f+4sop0odr7wg7j55+rAK07IZDQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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