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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8edd90eb52f75c976e5f9df105c6dbbec9c20595c4705c22c4b3b6b9dc5ff570' 
  AND token = 'JT8ohHCH1T/+2rjPXROPqbaqmhBE+gT9L3SGn3KHDaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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