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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb15a42ee99da8c0d85dfe6f2691e50bd1c6d62ae3458ad7207ba5b43cebfa0' 
  AND token = 'xMXTyVuda4UauBfwXtPySP4vzisWAGpxgEFs/1Ohe1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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