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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b8def23f7e7f0942af567430f69ead49f5d4655f0c8d3d28fe87e560d6f2c8' 
  AND token = 'gMQX0c4WVsX04ym11/YmVuADyZi+M6S65LwUQZW9dUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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