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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860a6cd83d4c34f53715e4c4840ff028f23893679c6b845933e13d5fef21480e' 
  AND token = 'hxzFAYJQluy3b3gqdEVz138sawlIbhcm2SDptEUUJfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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