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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca96b3b49ba50d8ce20e541e0807b39b81eca1e3f1b2dfde8cb8b1a8620754f' 
  AND token = 't4CVkP5QrW/cG+hsFuV+ifxDNMsfNblkc60Um7QSbHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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