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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4deef76c8a7b2c3204557b5dc5994adf29d1bd672e4081a2d22e0a8e5a57bf85' 
  AND token = 'GaL4eatBytLSU24aVhvn+MF9J8m3stUPYyGDqkbvlPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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