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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586e0ea1024cba14d50a0a7c5b030e041c125a6addab2c13a87d8e1535fe53ea' 
  AND token = 'wRTmARSJogp6975uxd/TSl1WqFu/hn3SbComOLX7CQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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