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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36f272fa2d3191c6e19d6036b55b40eeecb385cc959417309363b846166d8f5' 
  AND token = '8e0c5CklNSiYhifdBJMN0F1yTmC4aZJxoWTPx/LhqgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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