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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9ebc94ecd027a0d53db71f4bb13e9f628dd37bb7fa6a21ce8b2705fefe043d' 
  AND token = 'x/N1OZs+GZE25+hYfIR/574elbcZW1nFUZ/6tAYHoWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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