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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec5da0e8146125e349a1f87679c6fa539e135eaac0672e4b8b13ee3f3433d6a' 
  AND token = 'aocavino4hmj+F7ebmGSn/MqUMXRaLtHUvim2y/QHwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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