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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89240000e33ce9860001f7acef9e78b3871075023d10d0e4121a7597731e1c06' 
  AND token = 'DY6wn2prHc2y0cEsq97ELI5dKrApg7fIkVZF6Ce33Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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