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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b4aadf3066c5e55a2f4acaea26d96ea0736dcd62f9456078b3750edf48de91' 
  AND token = 'LNCi0Ma2bTtou0d0N7nrR+kEv2m29hopUYQKzEyUohs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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