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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb48ee098f3c7a975d777b6ae61085cdfff170559d5ab7ba5512e1594f972c6f' 
  AND token = 'RxwkOuum9jSRLCuPJoUFeq27KhseleaI2Gq3FjOCbUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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