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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420ead11292d8c9f0019263294478e64796c112f425d49cf87e9a09df4f93788' 
  AND token = 'DVdLvR9b5gvroyYzno4E3lHphiHALoas/xAUn7g5J2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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