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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854a2884e377b6333d02ad7d38091b52d80063dac569a2356bafada7f5555638' 
  AND token = 'suBLhyEJKmjoRomikV9g2ddDmt+B4T0HRfdtkb8/RpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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