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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12090e6d1156834d4fc069500bd7f0522df1aab556024ac4a8b87532301cc4f0' 
  AND token = 'e9qBYQI33IaWtiisalmZrggtoM6oQTJ2XzBfpIOqu9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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